• Microsoft Word is a word processor included in Microsoft Office and some editions of the now-discontinued Microsoft Works. The first version of Word, released in the autumn of 1983, was for the MS-DOS operating system and introduced the computer mouse to more users. Word 1.0 could be purchased with a bundled mouse, though none was required. Following the precedents of LisaWrite and MacWrite, Word for Macintosh attempted to add closer WYSIWYG features into its package. Word for Mac was released in 1985. Word for Mac was the first graphical version of Microsoft Word. Initially, it implemented the proprietary .doc format as its primary format. Word 2007, however, deprecated this format in favor of Office Open XML, which was later standardized by Ecma International as an open format. Support for Portable Document Format (PDF) and OpenDocument (ODF) was first introduced in Word for Windows with Service Pack 2 for Word 2007.
• Microsoft Excel is a spreadsheet editor that originally competed with the dominant Lotus 1-2-3 and eventually outsold it. Microsoft released the first version of Excel for the Mac OS in 1985 and the first Windows version (numbered 2.05 to line up with the Mac) in November 1987.
• Microsoft PowerPoint is a presentation program used to create slideshows composed of text, graphics, and other objects, which can be displayed on-screen and shown by the presenter or printed out on transparencies or slides.
• Microsoft OneNote is a notetaking program that gathers handwritten or typed notes, drawings, screen clippings and audio commentaries. Notes can be shared with other OneNote users over the Internet or a network. OneNote was initially introduced as a standalone app that was not included in any Microsoft Office 2003 edition. However, OneNote eventually became a core component of Microsoft Office; with the release of Microsoft Office 2013, OneNote was included in all Microsoft Office offerings. OneNote is also available as a web app on Office on the web, a freemium (and later freeware) Windows desktop app, a mobile app for Windows Phone, iOS, Android, and Symbian, and a Metro-style app for Windows 8 or later.
• Microsoft Outlook (not to be confused with Outlook Express, Outlook.com or Outlook on the web) is a personal information manager that replaces Windows Messaging, Microsoft Mail, and Schedule+ starting in Office 97; it includes an e-mail client, calendar, task manager and address book. On the Mac OS, Microsoft offered several versions of Outlook in the late 1990s, but only for use with Microsoft Exchange Server. In Office 2001, it introduced an alternative application with a slightly different feature set called Microsoft Entourage. It reintroduced Outlook in Office 2011, replacing Entourage.
• Microsoft OneDrive is a file hosting service that allows users to sync files and later access them from a web browser or mobile device.
• Microsoft Teams is a platform that combines workplace chat, meetings, notes, and attachments.
• Microsoft Publisher is a desktop publishing app for Windows mostly used for designing brochures, labels, calendars, greeting cards, business cards, newsletters, web sites, and postcards. Publisher will be discontinued in 2026.
• Microsoft Access is a database management system for Windows that combines the relational Access Database Engine (formerly Jet Database Engine) with a g…

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Office on the web is a free lightweight web version of Microsoft Office and primarily includes three web applications: Word, Excel and PowerPoint. The offering also includes Outlook.com, OneNote and OneDrive which are accessible through a unified app switcher. Users can install the on-premises version of this service, called Office Online Server, in private clouds in conjunction with SharePoint, Microsoft Exchange Server and Microsoft Lync Server.

Word, Excel, and PowerPoint on the web can all natively open, edit, and save Office Open XML files (docx, xlsx, pptx) as well as OpenDocument files (odt, ods, odp). They can also open the older Office file formats (doc, xls, ppt), but will be converted to the newer Open XML formats if the user wishes to edit them online. Other formats cannot be opened in the browser apps, such as CSV in Excel or HTML in Word, nor can Office files that are encrypted with a password be opened. Files with macros can be opened in the browser apps, but the macros cannot be accessed or executed. Starting in July 2013, Word can render PDF documents or convert them to Microsoft Word documents, although the formatting of the document may deviate from the original. Since November 2013, the apps have supported real-time co-authoring and autosaving files.

Office on the web lacks a number of the advanced features present in the full desktop versions of Office, including lacking the programs Access and Publisher entirely. However, users are able to select the command "Open in Desktop App" that brings up the document in the desktop version of Office on their computer or device to utilize the advanced features there.

Supported web browsers include Microsoft [New] Edge, the latest versions of Firefox or Google Chrome, as well as Safari 16 or later.

The Personal edition of Office on the web is available to the general public free of charge with a Microsoft account through the Office.com website, which superseded SkyDrive (now OneDrive) and Office Live Workspace. Enterprise-managed versions are available through Office 365. In February 2013, the ability to view and edit files on SkyDrive without signing in was added. The service can also be installed privately in enterprise environments as a SharePoint app, or through Office Web Apps Server. Microsoft also offers other web apps in the Office suite, such as the Outlook Web App (formerly Outlook Web Access), Lync Web App (formerly Office Communicator Web Access), Project Web App (formerly Project Web Access). Additionally, Microsoft offers a service under the name of Online Doc Viewer to view Office documents on a website via Office on the web.

Most versions of Microsoft Office (including Office 97 and later) use their own widget set and do not exactly match the native operating system. This is most apparent in Microsoft Office XP and 2003, where the standard menus were replaced with a colored, flat-looking, shadowed menu style.

The user interface of a particular version of Microsoft Office often heavily influences a subsequent version of Microsoft Windows. E.g.:-
• The toolbar, colored buttons and the gray-colored 3D look of Office 4.3 were added to Windows 95.
• The ribbon, introduced in Office 2007, has been incorporated into several programs bundled with Windows 7 and later.
• The flat, box-like design of Office 2013 (released in 2012) was replicated in Windows 8's new UI revamp.
Users of Microsoft Office may access external data via connection-specifications saved in Office Data Connection (.odc) files.

Office, on all platforms, supports editing both server files (in real time) and offline files (manually saved) in recent years. The support for editing server files (in real time) was originally introduced (in its current form) after the introduction of OneDrive (formerly SkyDrive). But, older versions of Office also have the ability to edit server files (notably Office 2007).

Both Windows and Office used service packs to update software. Office had non-cumulative service releases, which were discontinued after Office 2000 Service Release 1. Now, Windows and Office have shifted to predictable (monthly, semi-annual and annual) release schemes to update software.

Past versions of Office often contained Easter eggs. For example, Excel 97 contained a reasonably functional flight-simulator.